“Unknown Subject” – The BAU team searches for a serial rapist in Houston known as “The Piano Man” who has resurfaced and is assaulting his previous victims. Also, Prentiss tries to come to terms with her trauma from last year and with rejoining the team, on the 150th episode of CRIMINAL MINDS, Wednesday, Jan. 25 (9:00-10:00 PM, ET/PT) on the CBS Television Network. Guest stars include Jay Karnes (“The Shield,” “Sons of Anarchy”) as pianist Hamilton Bartholomew, Dina Meyer (“Starship Troopers”) as waitress and Piano Man victim Regina Lampert, and Penny Peyser (“Crazy Like a Fox,” “Knots Landing”) as Prentiss’ therapist Dr. Linda Merrill.